How reliable are my records?

[na4bart]

Let me start by saying I am not a mathmatician, so please keep your coments simple.
I have records of my play (as a prop) for many different games and limits in a spreadsheet separated by game and limit. I have my hourly rate and SD for each game and for all games lumped together. They comprise over 1000 hours of play (B&M). I am net loser in two games (crazy pineapple, E.O.), net winner in the rest. Overall net winner. This is about 34,000 hands played. Limits range from 20/40 down to 3/6. HR= 12.50 and SD= 177.00. Do I have enough data to be comfortable with assuming I do not improve my game? Can this even be answered?

Thanks